PMID- 37571609
OWN - NLM
STAT- PubMed-not-MEDLINE
LR  - 20230814
IS  - 1424-8220 (Electronic)
IS  - 1424-8220 (Linking)
VI  - 23
IP  - 15
DP  - 2023 Jul 31
TI  - A Wideband True Time Delay Circuit Using 0.25 microm GaN HEMT Technology.
LID - 10.3390/s23156827 [doi]
LID - 6827
AB  - This paper presents a wideband 4-bit true time delay IC using a 0.25 mum GaN HEMT 
      (High-Electron-Mobility Transistor) process for the beam-squint-free phased array 
      antennas. The true time delay IC is implemented with a switched path circuit 
      topology using DPDT (Double Pole Double Throw) with no shunt transistor in the 
      inter-stages to improve the bandwidth and SPDT (Single Pole Single Throw) 
      switches at the input and the output ports. The delay lines are implemented with 
      CLC pi-networks with the lumped element to ensure a compact chip size. A negative 
      voltage generator and an SPI controller are implemented in the PCB (Printed 
      Circuit Board) due to the lack of digital control logic in GaN technology. A 
      maximum time delay of ~182 ps with a time delay resolution of 10.5 ps is achieved 
      at DC-6 GHz. The RMS (Root Mean Square) time delay and amplitude error are <5 ps 
      and <0.6 dB, respectively. The measured insertion loss is <6.8 dB and the input 
      and output return losses are >10 dB at DC-6 GHz. The current consumption is 
      nearly zero with a 3.3 V supply. The chip size including pads is 2.45 x 1.75 
      mm(2). To the authors' knowledge, this is the first demonstration of a true time 
      delay IC using GaN HEMT technology.
FAU - Kim, Jeong-Geun
AU  - Kim JG
AD  - Department of Electronic Engineering, Kwangwoon University, Seoul 01897, Republic 
      of Korea.
FAU - Baek, Donghyun
AU  - Baek D
AUID- ORCID: 0000-0003-0675-1115
AD  - School of Electrical Engineering, Chung-Ang University, Seoul 06974, Republic of 
      Korea.
LA  - eng
GR  - UD200027ED/Agency for Defense Development/
PT  - Journal Article
DEP - 20230731
PL  - Switzerland
TA  - Sensors (Basel)
JT  - Sensors (Basel, Switzerland)
JID - 101204366
SB  - IM
PMC - PMC10422639
OTO - NOTNLM
OT  - GaN
OT  - phased array antenna
OT  - true time delay
COIS- The authors declare no conflict of interest.
EDAT- 2023/08/12 10:45
MHDA- 2023/08/12 10:46
PMCR- 2023/07/31
CRDT- 2023/08/12 01:23
PHST- 2023/05/21 00:00 [received]
PHST- 2023/07/19 00:00 [revised]
PHST- 2023/07/24 00:00 [accepted]
PHST- 2023/08/12 10:46 [medline]
PHST- 2023/08/12 10:45 [pubmed]
PHST- 2023/08/12 01:23 [entrez]
PHST- 2023/07/31 00:00 [pmc-release]
AID - s23156827 [pii]
AID - sensors-23-06827 [pii]
AID - 10.3390/s23156827 [doi]
PST - epublish
SO  - Sensors (Basel). 2023 Jul 31;23(15):6827. doi: 10.3390/s23156827.